it stands for load HL pair with data from the specified location in the register. eg. LHLD 9200
Aditi Misra
3rd yr,B.tech,CSE
Netaji Subhash Engineering College
There is an example of a LHLD 5000H diagram on this website: atelier-drachenhaus.de/timing-diagram-8085. This will provide an idea of how to draw the diagram.
The immediate instructions in the 8085 contain the operand in the instruction, as the second byte, rather than in a register. For instance, if you want to add 3 to the accumulator, you can use ADI 3. Without the immediate instructions you would need two instructions, LHLD {address-of-a-3}, ADD M, but you might also need to save and restore HL.
The 8085 is an 8-bit computer, with only limited capability to do 16 bit arithmetic. In order to add two 16-bit numbers, NUM1 and NUM2, together, and store the result at NUM3, you can use the code... LHLD NUM1 XCHG LHLD NUM2 DAD D SHLD NUM3 If you want to subtract NUM1 from NUM2, you need to take the two's complement first, by inverting it and adding one... LHLD NUM1 MOV A,H CMA MOV H,A MOV A,L CMA MOV L,A INX H ... and then continue with adding NUM2... XCHG LHLD NUM2 DAD D SHLD NUM3
What is the different between LXI and LHLD in 8085?LHLD 2050 Means..copy content of 2050 and 2051 to HL pairif2050 -> 90H2051->5AHLHLD 2050 implies..L -> 90HH -> 5AHLXI means..Load Register Pair with Immediate data.. 16bit dataLXI B ,2050HLoads BC pair with value 2050HB-> 20HC-> 50HIts similar to 2 MVI instructionieMVI H,20HMVI L,50Hwhich eventually implies..HL -> 2050Hthe advantage of LXI over MVI is that LXI is 3 byte and requires 10T states.Two MVI instruction is 4Byte and require 14Tstates...
Lxi b, 0000h lhld 8000h xchg lhld 8002h dcx d l006: lda 8002h add l mov l, a lda 8003h adc h mov h, a jnc l013 l013: inx b dcx d mov a, d ora e jnz l006 shld 8006h mov l, c mov h, b shld 8004h hlt
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To reverse the upper and lower byte of a 16-bit number in an 8085...LHLD {some number}MOV A,HMOV H,LMOV L,ASHLD {some number}If you want to preserve flags and registers, wrap that section of code in PUSH H, PUSH PSW, and POP PSW, POP H.
It means speaking to someone directly. Susan, clean up your room. Bob, hand me a flashlight. I told you already, Mom, I am not going. In these sentences, the direct address is to Susan, Bob, and Mom.
LHLD 2600h is use to store data of 2600h in L register and data of 2601h in H register While SHLD 2600h is use to store data of L in 2600h memory location and data of H in 2601h memory location data of H register
LHLD 4000H : Get first 16-bit number in HLXCHG : Save first 16-bit number in DELHLD 4002H : Get second 16-bit number in HLMOV A, E : Get lower byte of the first numberSUB L : Subtract lower byte of the second numberMOV L, A : Store the result in L registerMOV A, D : Get higher byte of the first numberSBB H : Subtract higher byte of second number with borrowMOV H, A : Store l6-bit result in memory locations 4004H and 4005H.SHLD 4004H : Store l6-bit result in memory locations 4004H and 4005H.HLT : Terminate program execution.
A two-byte instruction gives the specific function instruction in two bytes, or two words. The first specifies the opcode, which tells the microprocessor what operation will occur. The second specifies the operand, or the data that the operation is done on.
in cisc concept instruction set is complex but in case of risc the ins truction are reduced. for example for mov operation many instruction are there as mov,mvi,sta,lda,lhld,shld,stax,ldax etc. but in case of risc only load and store(lda ,sta) are used for all as in case of ARM processors.